Need help selecting appropriate servo for project

Help & Support Robot Parts
1

We are installing handicapped controls in an experimental airplane and need to control the throttle by wire.
We are looking at Hitec servos D854WP, HS-7955TG and others.
Our primary requirement is to be able to control the throttle with a cable in the event of servo failure.

If the servo and the cable are linked together and the power to the servo is disconnected can we overcome any drag from the servo?
Is there any significant drag from the un-powered servo?

Thanks in advance, we are completely new to servo technology.

Tom

2

Rotating the servo manually will depend on the torque ratings of the servo (which is related to the gearing ratio inside the servo).
Higher the torque, harder to rotate it manually.

Normally, regular RC Servos don’t provide too much high torque capabilities, therefore, they are relatively easy to rotate.